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A piece of rough diamond which has the typical non-transparent skin. This rough diamond is easily clarity graded since the skin is completely transparent. Commonly called a glassie. Color can be just as deceptive as clarity in grading.Often the skin of the piece of rough hides the true tinted body color. For example, a rough piece with a greenish skin will most likely end up as a medium to dark yellow.Even in a glassie, color may end up two to three grades lower after finishing.olor can be just as deceptive as clarity in grading. Often the skin of the piece of rough hides the true tinted body color. For example, a rough piece with a greenish skin will most likely end up as a medium to dark yellow.
Diamond is the hardest naturally occurring mineral, topping Mohs' Scale of Hardness with a relative hardness value of 10. Diamond is a polymorph of the element carbon, and graphite is another.While the two share the same chemistry, C (elemental carbon), they have very different structures and properties.iamond is an excellent electrical insulator, graphite is a good conductor of electricity. Diamond is the ultimate abrasive (its most important use), graphite is a very good lubricant. Diamond is transparent, graphite is opaque. Diamond crystallizes in the isometric system, graphite crystallizes in the hexagonal system.